---
title: "Introduction"
slug: "introduction-to-placeholders"
updated: 2024-05-04T18:48:56Z
published: 2024-05-04T18:48:56Z
canonical: "help.mail-and-deploy.com/introduction-to-placeholders"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.mail-and-deploy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction to Placeholders

#### General

Placeholders can be used in [Expressions](/release34/docs/introduction-to-mail-and-deploy-expressions) to dynamically insert values into the expression at runtime.

          
          

> **Example:** The [Save Content To File System Action](/release34/docs/save-content-to-file-system) has an *Output Path* property which is an [Expression](/release34/docs/introduction-to-mail-and-deploy-expressions) that returns the path to save the content to. You can use a [Global Variable Value Placeholder](/release34/docs/global-variable-value) in that expression that references a [Global Variable](/release34/docs/global-variables) that contains the path (or parts of the path) to save the content to.

The following types of placeholders are supported:

| Placeholder Type | Description |
| --- | --- |
| [Datasource Field Value](/release34/docs/datasource-field-value) | A placeholder that can be used to insert the value of a [Datasource](/release34/docs/introduction-to-datasources) field. |
| [Datasource Object Title](/release34/docs/datasource-object-title) | A placeholder that can be used to insert the title of a [Datasource](/release34/docs/introduction-to-datasources) object. |
| [Datasource Variable Value](/release34/docs/datasource-variable-value) | A placeholder that can be used to insert the value of a [Datasource](/release34/docs/introduction-to-datasources) variable. |
| [Expression Parameter](/release34/docs/expression-parameter) | A placeholder that can be used to insert the value of an [Expression](/release34/docs/introduction-to-mail-and-deploy-expressions) parameter. |
| [Global Variable Value](/release34/docs/global-variable-value) | A placeholder that can be used to insert the value of a [Global Variable](/release34/docs/global-variables). |
| [Report Parameter](/release34/docs/report-parameter) | A placeholder that can be used to insert the value of a [Report](/release34/docs/introduction-to-reports) parameter. This placeholder can only be used in [Expressions](/release34/docs/introduction-to-mail-and-deploy-expressions) within a report. |
| [Task Parameter](/release34/docs/task-parameter) | A placeholder that can be used to insert the value of a [Task](/release34/docs/tasks) parameter. This placeholder can only be used in [Expressions](/release34/docs/introduction-to-mail-and-deploy-expressions) within a taks. |

          NOTE

          

You can use multiple placeholders in a single [Expression](/release34/docs/introduction-to-mail-and-deploy-expressions); however, not all types of placeholders are supported in all expressions (e.g. the [Task Parameter Placeholder](/release34/docs/task-parameter) can only be used in expressions within a [Task](/release34/docs/tasks)).